Chemistry affects trading. Belive it or not, even you claim you are a mechanical or system trader. There is no escape. Some chemistry helps you win some time doesn't. I wonder it may not overstate that chemistry is one of the most critical factors among successful traders. If I had every cent for when chemistry affects someone's trading, I would be richer than W. Gates. Believe me you need to find out the right chemistry for you for the most of the time. You need your lucky chemistry.